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  <title>Astable Multivibrator with 555</title>
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  <meta content="Anantha Narayan" name="author">
  <meta content="An Interactive Calculator and Tutorial to learn Astable 555 Multivibrator" name="description">
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      <td align="center" valign="middle" width="150">
      <table align="center" border="0" cellpadding="0" cellspacing="0"
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            <table border="0" cellpadding="2" cellspacing="2"
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                  <td valign="top"><img title="Low" alt="Low"
 src="gifs/green_off.gif" name="lo_led" align="middle" height="28"
 width="28"></td>
                  <td valign="top"><img title="High"
 src="gifs/yellow_off.gif" alt="High" name="hi_led" height="28" width="28"></td>
                  <td align="center" valign="middle">
                  <form name="freq_f" action=""> <input
 alt="Frequency - Hz" title="Frequency - Hz" readonly="readonly"
 name="freq" size="6" value="0 Hz"> </form>
                  </td>
                  <td align="center" valign="middle">
                  <form name="period_f" action=""> <input
 title="Period - Sec" alt="Period - Sec" readonly="readonly"
 name="period" size="6" value="0 S"> </form>
                  </td>
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              </tbody>
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            </td>
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          <tr>
            <td align="center" nowrap="nowrap" valign="middle">
            <form name="ra_set" action="">
Ra&nbsp;<input readonly="readonly" name="ra_dsp" size="6"
 value="5">
              <select onchange="ra_range();" name="range_ra">
              <option selected="selected" value="1000">K</option>
              <option value="1000000">M</option>
              </select>&nbsp;Ohms<br>
 <input onclick="dec_ra(10);"
 value="&lt;&lt;" type="button"> <input onclick="dec_ra(1);" value=" &lt; "
 type="button"><input onclick="inc_ra(1);" value=" &gt; " type="button"> <input
 onclick="inc_ra(10);" value="&gt;&gt;" type="button">
            </form><br>
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            <td align="center" nowrap="nowrap" valign="middle">
            <form name="rb_set" action="">
Rb&nbsp;<input readonly="readonly" name="rb_dsp" size="6"
 value="100">
              <select onchange="rb_range();" name="range_rb">
              <option selected="selected" value="1000">K</option>
              <option value="1000000">M</option>
              </select>&nbsp;Ohms<br>
 <input onclick="dec_rb(10);"
 value="&lt;&lt;" type="button"> <input onclick="dec_rb(1);" value=" &lt; "
 type="button"> <input onclick="inc_rb(1);" value=" &gt; " type="button"> <input
 onclick="inc_rb(10);" value="&gt;&gt;" type="button">
            </form><br>
            </td>
          </tr>
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            <td align="center" nowrap="nowrap" valign="middle">
            <form name="ct_set" action="">
Ct&nbsp;<input readonly="readonly" name="ct_dsp" size="6"
 value="1">
              <select onchange="range_sel();" name="cap_range">
              <option selected="selected" value="1000000">u</option>
              <option value="1000000000">n</option>
              </select>&nbsp;Farad<br>
<input onclick="dec_ct(10);"
 value="&lt;&lt;" type="button"> <input onclick="dec_ct(1);" value=" &lt; "
 type="button"> <input onclick="inc_ct(1);" value=" &gt; " type="button"> <input
 onclick="inc_ct(10);" value="&gt;&gt;" type="button">
            </form><br>
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            <table border="0" cellpadding="0" cellspacing="0"
 width="100%">
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                  <td align="center" valign="middle">
                  <form name="duty_f" action=""> <input
 title="Duty Cycle - %" alt="Duty Cycle - %" name="duty" size="8"
 value="0"> </form>
                  </td>
                  <td align="center" valign="middle"><img
 title="On" alt="On" src="gifs/red_off.gif" name="power_led"
 align="middle" height="28" width="28"></td>
                  <td align="center" valign="middle"><img
 title="Power On-Off" src="gifs/red_button_up.gif" alt="Power On-Off"
 name="red_btn" onclick="not_toggle();" align="middle" height="39"
 width="44"></td>
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   <a target="_blank" href="http://www.delabs-circuits.com/">delabs Circuits</a>
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